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Show #82 (season 5, edition 28)

Debut: FRIDAY, OCT. 6 (7:30-8:00 p.m. ET/PT)

" 'Post-Truth' News": The U.S. is more divided across party lines than ever before in recent history, and nowhere is this division more visible than in the media. With President Trump waging a war on mainstream news outlets and the rise of hyperpartisan sites spreading misinformation, trust in the traditional press has fallen to a record low of 32%. Correspondent Isobel Yeung looks at what's driving the media's battle over facts and the polarization of the American public in the Trump era.

"Microbiome": Powerful antibiotics and widespread sanitation practices have expanded lifespans across the industrialized world, but at a cost. Microbiome, or the trillions of microbes collectively working in the body to help regulate the immune system and food digestion, has lost much of its health-promoting bacteria thanks to modern lifestyles and sanitation practices. Scientists across the world are now looking to the planet's few remaining pre-industrialized societies to see what industrialized guts have lost, and in doing so, could fundamentally change the way they think about germs. Correspondent Thomas Morton heads to the Central African Republic to see the emerging field of microbiome science.